General/Analytical Identification

General/Analytical Identification of PCB

In accordance with the Toxic Substance Control Act, proper PCB identification labels must be visible near the access to the transformers and also on the transformer itself.

As a common measure, it is helpful to note that a basic physical parameter such as density can help in differentiating between mineral oil and PCBs. Mineral oil has a density range of 810-860 kg/m3 while PCB-containing oil ranges from 1000-1150 kg/m3 or even more depending upon the concentration of PCBs. Generally, a transformer will have a nameplate attached to the unit indicating the name of the dielectric fluid, the approximate weight in pounds or kilograms, and the amount of fluid, usually in gallons or liters. However, this is not a completely reliable method.

Trade name for pure (hazardous) PCBs include: Asbestol, Aroclor, Askarel, Clophen, Chlorextol, Fenclor, Inerteen, Kanechlor, Noflamol, Phenoclor, Pyralene, Pyranol, Saf-T-Kuhl, Sovol, Sovtol, Hydol, Therminol etc. In the absence of the oil brand name on the nameplate, an alternate way to determine the presence of PCBs accurately is to test the dielectric fluid.

Typical Gas Chromatogram patterns obtained from oils and ‘Aroclor’ standards is shown in the following figure. The varying concentrations are indicated by the peaks.

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